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QCM 7 : Précharge et postcharge cardiaque : A. Lorsque la postcharge augmente, la rapidité de contraction cardiaque augmente. B. La postcharge correspond au degré d'étirement du muscle cardiaque C. A une postcharge donnée, la vitesse de raccourcissement est plus importante lorsque la précharge est elle aussi plus élevée D. A une postcharge donnée la noradrénaline augmente la rapidité de contraction cardiaque E. La précharge est la pression qui s'oppose à l'ouverture des valves aortiques et pulmonaire

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